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The upper limb contains 32 bones, including the scapula (shoulder blade), clavicle (collar bone), humerus (bone of the arm), radius and ulna (bones of the forearm), carpal bones (8 bones of the wrist), and metacarpals (5 bones of the hand).
Understanding the bones of the upper limb is crucial for grasping the general topography, muscle and ligament attachments, articulation positions, movement ranges, and common fractures associated with these bones.
There are eight carpal bones arranged in two rows: the proximal row (scaphoid, lunate, triquetral, pisiform) and the distal row (trapezium, trapezoid, capitate, hamate).
The mnemonic 'She Looks Too Pretty. Try To Catch Her' helps to remember the carpal bones in order from lateral to medial.
The primary ossification centers for the proximal phalanx appear at the 10th week of intrauterine life (IUL), for the middle phalanx at the 12th week of IUL, and for the distal phalanx at the 8th week of IUL.
The shaft of the phalanges tapers towards the head, has a convex dorsal surface from side to side, and a flat palmar surface that is gently concave along the long axis.
The heads of the proximal and middle phalanges are pulley-shaped, while the head of the distal phalanx is non-articular and features a rough horseshoe-shaped tuberosity.
The secondary ossification centers appear at different times: the upper end of the humerus at 9 years, the lower end at 6 years, and fusion occurs at 18 years for the upper end and 20 years for the lower end.
Common fractures in the upper limb include those of the clavicle, humerus, radius, and carpal bones, often resulting from falls or direct trauma.
The ossification of carpal bones begins at different times, with the capitate being the first to ossify and the pisiform being the last. The timeline varies, with some bones ossifying as early as the second month and others as late as the twelfth year.
The carpal bones provide stability and flexibility to the wrist, allowing for a wide range of movements and serving as a base for the metacarpals.
Primary ossification centers appear during fetal development for the shaft of bones, while secondary ossification centers develop after birth at specific locations, such as the ends of long bones, and are involved in growth and development.
Knowledge of carpal bone ossification is important for determining the bone age of children, which can aid in diagnosing growth disorders and planning treatment.
The two main groups of bones in the hand are the metacarpals (5 bones) and the phalanges (14 bones), which include proximal, middle, and distal phalanges.
The bones of the upper limb provide a framework for muscle attachment, allowing for a wide range of movements such as flexion, extension, abduction, and rotation.
The scapula, or shoulder blade, is positioned on the posterior side of the thorax, articulating with the humerus at the glenohumeral joint and with the clavicle at the acromioclavicular joint.
The clavicle serves as a strut that connects the arm to the body, providing stability to the shoulder and allowing for a wide range of arm movements.
The humerus is characterized by its long shaft, proximal head that articulates with the scapula, and distal condyles that articulate with the radius and ulna at the elbow.
The radius and ulna are the two long bones of the forearm that allow for pronation and supination, enabling the hand to rotate and perform various tasks.
The carpal bones articulate with the metacarpals at the carpometacarpal joints, allowing for movement and flexibility of the hand.
The olecranon process is the bony prominence of the ulna that forms the elbow's tip, providing leverage for the muscles that extend the forearm.